KR20200040755A - Method for manufacturing parts and parts manufactured according to the above method - Google Patents

Abstract

The present invention relates to a method for manufacturing a component, in particular a component for an energy system, such as a fuel cell or electrolytic cell, the method comprising: continuous steps: a) a first roll from a metal plate having a metal plate material thickness less than 500 μm Providing, b) unwinding the metal plate from the first roll by conveying the first end of the first roll in a feed direction, c) coating one or more regions of the first end of the first roll and subsequent metal plate regions Transporting through the device, causing at least one side of the metal plate to be coated by a physical and / or chemical vapor deposition process within the coating device, d) performing one or more deformation processes on the coated metal plate, e) Forming a plurality of parts by cutting from the coated metal plate, and f) winding the remaining coated metal plate into a second roll, wherein the gold from the first roll to the second roll And a step in which the continuous feeding of the sheet carried out. The present invention also relates to bipolar plates, fuel cells and electrolytic cells.

Description

Method for manufacturing parts and parts manufactured according to the above method

The present invention relates to a method for manufacturing parts, especially parts for energy systems, such as fuel cells or electrolyzers. The invention also relates to parts manufactured according to the above method. The present invention also relates to a bipolar plate and a fuel cell or electrolytic cell equipped with the bipolar plate.

Electrochemical systems such as fuel cells, in particular polymer electrolyte fuel cells, and conductive current collecting plates and electrolyzers for such fuel cells, and current collectors in galvanic cells and electrolytic cells are known.

Examples are fuel cells, in particular bipolar plates or monopolar plates in oxygen half cells. The bipolar plate or monopolar plate is formed in the shape of a carbon plate containing carbon as a main component (for example, a graphoil plate). Since these plates tend to be brittle and are relatively thick, they significantly reduce the amount of power in the fuel cell. Another disadvantage is the insufficient physical (eg thermodynamic) and / or chemical and / or electrical stability of these plates.

In addition, the manufacture of a current collector plate for a fuel cell made of metallic (especially austenitic) stainless steel is also known. In this regard, see for example DE 10 2010 026 330 A1. The advantage of these plates is that the thinner thickness of the plate can be sweetened. In order to keep the weight as well as the installation space of the fuel cell as small as possible, a thin thickness is directed. However, the manufacture of such plates is complex because these plates must be provided with a flow guide path and additionally a surface coating that normally prevents corrosion. Therefore, in view of manufacturing cost, the manufacturing process of such a bipolar plate is not sufficiently efficient at present.

DE 10 2009 056 728 A1 discloses the production of sheet metal parts by deformation of sheet metal blanks. The disadvantage is that the coating applied before the deformation step can be damaged by subsequent deformation.

DE 10 2010 056 016 A1 discloses an apparatus for manufacturing a bipolar plate, in which case a roll-to-roll process is used when processing a metal substrate strip. In this process, two metal substrate strips are processed in parallel to form an anode plate and a cathode plate which are later joined by laser welding to one bipolar plate. For the described inline method, the execution of a deformation process, a cutting process, a calibration process, a coating process, a cleaning process, a folding process, a heating process, a cooling process and / or other processes performed in parallel for each metal substrate strip is performed. Is mentioned.

DE 100 58 337 A1 discloses a sheet metal product for use as a bipolar plate, having a metal oxide coating on at least one side. This plate has embossing produced by deformation, in which case the coating can be applied on the sheet metal before and after the deformation process.

Therefore, it is an object of the present invention to provide a more efficient method for manufacturing parts, especially parts for energy systems such as fuel cells or electrolyzers.

The above task, in accordance with the present invention, the following steps:

a) providing a first roll from a metal plate having a metal plate material thickness of less than 500 μm,

b) unwinding the metal plate from the first roll by conveying the first end of the first roll in the supply direction,

c) transferring the first end of the first roll and the subsequent metal plate area through one or more coating devices, and coating at least one side of the metal plate in the coating device by a physical and / or chemical vapor deposition process,

d) performing one or more deformation processes on the coated metal plate,

e) forming a plurality of parts by cutting from the coated metal plate, and

f) winding the coated residual metal plate with a second roll, wherein the continuous transfer of the metal plate from the first roll to the second roll is performed

It is solved by a method for manufacturing parts, especially parts for energy systems, such as fuel cells or electrolytic cells, including.

The metal plate is coated in a roll-to-roll process according to the invention. After that, deformation of the coated metal plate and separation of parts formed from the coated metal plate are performed. This process simplifies the handling of the metal plate during coating and enables quick and automated handling of the coated metal plate. The web of coated metal strip remaining after separation of the parts is wound on a second roll. Surprisingly, as the coating on the metal plate is not damaged at all or only slightly by subsequent deformation and cutting processes, the electrical properties are suitable for use with components in energy systems.

When a first roll made of a metal plate is close to its end, and the second end of the metal plate lying opposite the first end is unwound from a reel, the second end of the metal plate is preferably a new metal plate. The first end of the first roll is connected, for example by welding. Thereby, the manufacturing process can be automated and operated continuously in a roll-to-roll "in-line" manner.

In one preferred embodiment of the method, a metal plate having a material thickness in the range of 100 to 200 μm is used. Preferably, the metal plate is steel or stainless steel, especially austenitic stainless steel. Alternatively, a metal plate made of titanium or titanium alloy can be used.

One or more deformation processes include, inter alia, deep drawing and / or extrusion processing and / or hydroforming. However, another modification process as defined in DIN 8582 and cutting of the metal plate can also be performed on an already coated metal plate.

The formation of a gas distribution structure, which is usually provided for bipolar plates, is preferably carried out by deformation and / or shear cutting.

The process of cutting a part from a coated and deformed metal plate is carried out in particular by shear cutting, preferably by stamping.

By means of one or more coating devices, a layer system is provided on a metal plate, in particular comprising a cover layer facing away from the metal plate, the cover layer being formed from a homogeneous or heterogeneous metal solid solution, the solid solution being a precious metal in the form of iridium Contains a first chemical element selected from the group at a concentration of 99At .-% or more, or a first chemical element selected from the group of precious metals in the form of iridium and a second chemical element selected from the group of precious metals in the form of ruthenium, wherein the first chemical element And the second chemical element element is present in a total concentration of 99At .-% or more, and further contains one or more base metal chemical elements selected from the group containing nitrogen, carbon, and fluorine, and also optionally oxygen and / or Hydrogen is only present in trace amounts.

The cover layer has very good suitability and sufficient ductility for the method according to the invention, so that it is not damaged at all or only slightly by the deformation process carried out after being provided on the metal plate. Such a cover layer is formed so as to still have sufficient electrical conductivity, electrocatalytic activity, and anti-corrosion property after the deformation process and separation process.

Homogeneous metal solution (Type 1) means that the non-metallic chemical elements mentioned are dissolved in the metal lattice so that the lattice type of the host metal or host metal alloy does not substantially change.

The heterogeneous metal solution means that, in addition to the metal-containing phase, one of the non-metal chemical elements is basically present as a mixed phase. Thereby, for example, elemental carbon may be present in addition to the alpha phase (type 1) depending on the characteristics of the phase diagram. Depending on the deposition conditions, the layer according to the invention can be metastable or stable from a thermodynamic point of view.

By using a carbon-containing cover layer and, in addition, using a metal that is a metalloid or nonmetallic chemical element, the conductivity of the cover layer is higher than that of gold, and at the same time, the oxidation stability of the cover layer in an acidic solution is that of a standard hydrogen electrode. It was confirmed that it was clearly higher than the voltage of 2000mV. The measured specific electrical resistance (under standardized conditions, ie at a compressive force of 140 N / cm 2) can be equivalent to gold, depending on the embodiment. The specific electrical resistance of gold is approximately 10 mΩ · cm ⁻² at room temperature (T = 20 ° C).

Another important advantage is that iridium does not oxidize and dissolve at voltages above the value "E = 2.04-0.059 Ig pH- -0.0295 Ig (Ir0 ₄ ) ^2- ". That is, in the solid solution, the low value of iridium is stabilized such that conventional oxidation no longer occurs in 1 mol / l (1N concentrated) sulfuric acid (H ₂ SO ₄ ) at approximately 1800 mV. A measure for stabilization is the gain in free partial mixing energy (ΔG _mixing ) of solid solutions or solid compounds.

The cover layer is preferably laminated with a layer thickness of 1 nm or more to 10 nm or less. Despite this very small layer thickness, deformation of the coated metal sheet is surprisingly possible.

One or more non-metallic chemical elements, ie carbon and / or nitrogen and / or fluorine, are preferably present in the cover layer at a concentration in the range of 0.1At .-% to 1At .-%. In particular, the non-metallic chemical element carbon is contained in the cover layer in a concentration range of 0.10 to 1At .-%. In particular, the non-metallic chemical element nitrogen is contained in the cover layer in a concentration range of 0.10 to 1At .-%. In particular, the non-metallic chemical element fluorine is contained in the cover layer in a concentration range of up to 0.5At .-% or less.

Especially,

a) 99At .-% or more of iridium and additionally carbon, or

b) at least 99At .-% iridium and additionally carbon and traces of oxygen and / or hydrogen, or

c) at least 99At .-% of iridium and further carbon and fluorine, optionally further traces of oxygen and / or hydrogen, or

d) total 15 to 98.9At .-% of iridium and 0.1 to 84At .-% of ruthenium and further carbon, or

e) 15 to 98.9At .-% total iridium and 0.1 to 84At .-% ruthenium and further carbon and traces of oxygen and / or hydrogen, or

f) A cover layer further comprising 15 to 98.9At .-% total iridium and 0.1 to 84At .-% ruthenium and additionally carbon and fluorine, optionally traces of oxygen and / or hydrogen, has been found suitable.

Further, the cover layer may contain one or more chemical elements selected from the group of non-metals. In this case, one or more chemical elements selected from the non-metallic group are preferably formed of aluminum, iron, nickel, cobalt, zinc, cerium or tin, and / or contained in the coating in a concentration range of 0.005 to 0.01At .-%.

In another preferred embodiment of the cover layer, the cover layer contains one or more chemical elements selected from the group of refractory metals, in particular titanium and / or zirconium and / or hafnium and / or niobium and / or tantalum. It has been shown that by the addition of refractory metals, the H ₂ O ₂ and ozone produced during electrolysis are further controlled proportionately.

Another advantage of using such metals-in elemental or compound form-is that these metals form a self-protecting stable conductive oxide under corrosive conditions.

Cover layers comprising one or more refractory metals have high conductivity and high corrosion resistance, particularly in the temperature range of 0 to approximately 200 ° C. Thus, for example, excellent properties for permanent use in fuel cells are realized.

Another advantage is whether the electrical conductor is formed, for example, like a bipolar plate for a low temperature polymer electrolyte fuel cell or a bipolar plate for a high temperature polymer electrolyte fuel cell, especially for electrical conductors such as metal bipolar plates. Derived from the coating.

One or more chemical elements selected from the group of refractory metals are preferably contained in the cover layer in a concentration range of 0.005 to 0.01At .-%.

As long as at least one chemical element selected from the non-metal group is present in the form of tin, this element and at least one chemical element selected from the refractory metal group are contained together in the cover layer in a concentration range of 0.01 to 0.2At .-%.

It has also been demonstrated that the cover layer is also suitable when it comprises at least one additional chemical element selected from the group of precious metals in a concentration range of 0.005 to 0.9At .-%. Chemical elements selected from the group of precious metals are in particular platinum, gold, silver, rhodium, and palladium.

It has been demonstrated that all the chemical elements of the precious metal group, i.e., iridium and ruthenium, are contained in the cover layer in a concentration range of greater than 99At .-%.

Corrosion protection on the metal plate is further improved by providing a cover layer on a lower layer system formed between the metal plate and the cover layer. This is particularly advantageous when a corrosive ambient medium is present, especially when the corrosion medium contains chloride.

The lower oxidation, that is, the surface oxidation of the metal plate with the cover layer laminated on the surface, generally leads to peeling of the precious metal layer on it.

As such, the layer system is further preferably formed by including a sub-layer system, in which case the sub-layer system has at least one sub-layer comprising at least one chemical element selected from the group titanium, niobium, hafnium, zirconium, tantalum.

Thus, the layer system comprises a cover layer and a sub-layer system, in which case the cover layer is arranged towards the far side from the metal plate.

The sublayer system is formed comprising a first sublayer in the form of a metal alloy layer, in particular comprising the chemical elements titanium and niobium, in particular 20 to 50% by weight of niobium and the balance of titanium.

The sub-layer system is further formed in particular comprising a second sub-layer further comprising at least one chemical element selected from the group titanium, niobium, zirconium, hafnium, tantalum and at least one non-metallic element selected from the group nitrogen, carbon, boron, fluorine. .

In one particularly preferred embodiment, the second sub-layer has the following chemical element,

a) titanium, niobium and additionally carbon and fluorine, or

b) titanium, niobium and additional nitrogen

It is formed including.

In particular, the second sub-layer is _{(Ti 0 67 Nb 0 33.} .) 1 - is formed by _x N _x, where x = 0.40 to 0.55. In this case, the material has a second sub-layer of Ti _{0 . 67} in a manner that is generated by Nb _{0 .33} atomization (atomization) of the target made _{of, (Ti 0 67 Nb 0 33} ..) 1 - x N x is formed in a name '(where, x = 0.40 to 0.55), In this case, nitrogen in the gas phase is impregnated into the second lower layer at a concentration of 40 to 55At .-%.

The second sub-layer is preferably disposed between the first sub-layer and the cover layer.

The second sub-layer may further contain up to 5At .-% oxygen.

The bipolar plate according to the invention comprises one or more parts made according to the method according to the invention. In particular, such a bipolar plate includes two or more parts connected to each other. In this case, the parts can be connected to each other by joining, in particular by welding, soldering, through joining or gluing, or by rivet joints or screwing.

The fuel cell according to the invention, in particular the polymer electrolyte fuel cell, comprises at least one bipolar plate according to the invention as described above. The electrolyzer according to the invention likewise comprises one or more bipolar plates according to the invention as described above.

Such fuel cells, in particular polymer electrolyte fuel cells, have proven to be very desirable in terms of electrical cuffs and corrosion resistance with low manufacturing costs. In particular, at 2000 mV, when measured as a change in surface resistance (in units of mΩ · cm ⁻² ), an oxidation stability of less than 20 mΩ · cm ⁻² can be achieved. As such, such fuel cells have a long lifespan of at least 10 years, or more than 5,000 operating hours or 60,000 operating hours of automobiles in stationary applications.

With the electrolytic cell according to the invention, which operates on the principle of opposite action with respect to the fuel cell, and which uses a current to cause a chemical reaction, i.e. material conversion, an equally long service life can be achieved. In particular, the electrolytic cell is an electrolytic cell suitable for hydrogen electrolysis.

In a preferred manner, a cover layer thickness of less than 10 nm is sufficient to protect against resistive oxidation of the second sub-layer. To form a positive corrosion protection, the sublayers of the lower layer system are formed of one or more refractory metals, the one or more refractory metals being at least two layers over steel, especially stainless steel, more precisely firstly a metal layer or alloy layer (= First sub-layer) and then as a semi-metal layer (= second sub-layer). The double layer formed by using two layers under the cover layer ensures electrochemical adaptation to the metal plate on one side and pore formation due to oxidation and hydrolysis processes on the other side is excluded.

The reason for the electrochemical adaptation to the metal plate is that the cover layer as well as the semi-metal layer (= second sub-layer) is very precious. When forming pores, high local element potentials can be created as a result of unacceptable corrosion currents. The metallic first sub-layer is preferably formed of titanium or niobium or zirconium or tantalum or hafnium or alloys of these metals, which are less noble than carrier materials in the form of, for example, stainless steel, in particular of stainless steel, first during the corrosion process Reactions form insoluble oxides or bulky hydroxyl compounds in the form of partial gels of such refractory metals. The pores thereby grow to protect the base material or metal plate from corrosion. This is a self-healing process of the layer system.

In particular, the second sub-layer in the form of a nitride layer is used as a hydrogen barrier, thereby protecting not only the metal plate of the bipolar plate made of stainless steel, but also the metallic first sub-layer from hydrogen embrittlement.

Still other advantages, features and details of the invention are set forth in the detailed description of the preferred embodiments and figures below. The features and feature combinations mentioned in the preceding detailed description can be used in the form of combinations specified respectively, as well as in other combinations or alone without departing from the scope of the invention.

1 is a schematic diagram of a process flow for the proposed method.
2 is a view showing parts formed according to the proposed method.
3 is a cross-sectional view of the part according to FIG. 2 in the region of a layered layer system.

1 schematically shows a process flow for the proposed method for manufacturing the parts 1a, 1b, 1c, wherein a first roll 20 is provided from the metal plate 2, and the metal plate 2 is In the roll-to-roll process, it is unwound from the first reel 30 and transferred in the direction of the second reel 30 '. In this case, the material thickness of the metal plate 2 is less than 500 μm.

The transfer of the first end of the first roll 20 and subsequent transfer of the metal plate area is carried out through one or more first coating devices 200a in which the lower layer system 4 (see FIG. 3) is formed. At this time, the metal plate 2 is coated on at least one side by a physical and / or chemical vapor deposition process, in which case the entire surface of the metal plate 2 may be coated or only partial coating may be performed.

The metal strip 2 and the subsequent metal plate region are subsequently conveyed through one or more second coating devices 200b on which the cover layer 3a (see FIG. 3) will be formed. In this case, the metal plate 2 is coated on at least one side by a physical and / or chemical vapor deposition process, at least in the region of the lower layer system 4.

The coated metal plate 2 ′ is now transferred into one or more deformation units 300. There, a deformation process is performed on the coated metal plate 2 ', in particular for the formation of the gas distribution structure 5. At this time, the coated metal plate 2 'is deformed in three dimensions, and in some cases, a slot or recess is formed in the coated metal plate in another deforming unit and / or shearing unit 400. It also becomes. The coated and deformed metal plate 2 "is supplied to the stamping unit 500 to form a plurality of parts 1a, 1b, 1c. The parts 1a, 1b, from the coated and deformed metal plate 2", The cutting of 1c) is performed. The parts 1a, 1b, 1c are conveyed down through the conveying unit 600.

The remaining metal plate 2 ′ ′ coated is wound onto the second roll 20 ′ by the second reel 30 ′, wherein the metal plate 2 is transferred from the first roll 20 to the second roll 20 ′. In this case, the processing of the metal strip 2 is performed efficiently and cost-effectively in a so-called in-line process.

After passing through one or more coating devices, it may be necessary to cool the coated metal plate. As such, one or more cooling chambers may be intermediately connected between the one or more coating devices and the one or more deformation units. In addition, prior to the one or more coating devices, one or more vacuum chambers used to generate the required atmospheric pressure in the metal strip may be connected, in addition to the selective preheating or heating of the metal strip, especially before being inserted into the one or more coating devices. Thus, physical and / or chemical vapor deposition processes are usually performed in vacuum.

FIG. 2 shows parts 1a, 1b having a gas distribution structure 5, formed according to the method shown in FIG. 1, in which case the parts 1a, 1b are one bipolar plate by laser welding. (10). Each component 1a, 1b has a layer system 3 comprising a cover layer 3a. The same reference numerals as in Fig. 1 denote the same elements.

FIG. 3 shows a cross section through the part 1a according to FIG. 2 in the area of the layered layer system 3. On a metal plate 2 made of stainless steel, a layer system 3 is provided from one side over the entire surface. The layer system 3 includes: a cover layer 3a; And a lower layer system 4 including a first lower layer 4a and a second lower layer 4b.

The metal plate 2, in this embodiment, for the bipolar plate 10 of a polymer electrolyte fuel cell for the conversion of (modified) hydrogen, has very high known requirements with respect to stainless steel, especially corrosion resistance, eg DIN It is made in the form of conductors of so-called austenitic steel materials with ISO material number 1.4404.

The layer system 3 is formed on the metal plate 2 by a coating process, for example, a vacuum-based coating process (PVD), in which case the metal plate 2 is first, for example 0.5 μm thick, in one process cycle. Coated with a first sub-layer 4a in the form of a titanium layer, followed by a second sub-layer 4b in the form of a titanium nitride layer, for example 1 μm thick, and finally an iridium-carbon layer, for example 10 nm thick It is coated with a cover layer 3a in the form. The cover layer 3a corresponds to an open layer on one side, because another layer, in this embodiment, only one side of the cover layer of the second sub-layer 4b is formed to contact the cover layer. Thus, the free surface of the cover layer 3a is placed and exposed directly adjacent to the electrolyte, especially the polymer electrolyte, in the fuel cell.

In the second embodiment, the metal plate 2 for the bipolar plate 10 is first coated with a first sub-layer 4a in the form of a 100 nm thick metal alloy layer, in which case the metal alloy layer has a composition Ti _0.67 Nb _0.33 . Have Then, x = 0.40 to 0.55 in the composition _{(Ti 0 67 Nb 0 33.} .) 1 - the additional stack of the second sub-layer (4b) having a thickness of 400㎚ _x N _x is carried out. Then, a cover layer 3a of an iridium-carbon composition with a thickness of 10 nm is stacked.

An advantage of the bipolar plate 10 according to the invention is that it has a particularly high stability to oxidation. Even under a constant load of +3000 mV, no increase in resistance was observed in a sulfuric acid solution having a pH-value of 3 compared to a normal hydrogen electrode. Externally, the free surface of the cover layer 3a, whereby the surface of the cover layer 3a formed toward the far side from the metal plate 2, retains silver color even after 50 hours of continuous load at +2000 mV compared to a normal hydrogen electrode. do. Even in scanning electron microscopy, no trace of corrosion that extends toward the metal plate 2 or reaches the metal plate 2 by the thickness of the cover layer 3a can be detected.

The cover layer 3a of the second embodiment can be applied by a vacuum-based PVD sputtering technique as well as a cathode ARC coating process, also called vacuum arc evaporation. Although the number of droplets is larger, in other words, the number of metal droplets is increased compared to the sputtering technique, the cover layer 3a manufactured in the cathode ARC process is also time-stable surface conductivity, and at the same time, the cover layer 3a produced by sputtering technique. It has high corrosion resistance.

In the third embodiment, a layered system 3 in the form of a structured stainless steel perforated sheet is formed on the metal plate 2. The metal plate 2 is polished electrolytically in an H ₂ SO ₄ / H ₃ PO ₄ bath before providing the layer system 3. After only one sublayer is stacked in the form of a tantalum carbide layer thousands of nm thick, a cover layer 3a in the form of a iridium-carbon layer hundreds of nm thick is stacked.

The advantage of the lower layer formed of tantalum carbide is not only the excellent corrosion resistance of the lower layer itself, but also that it is used as a hydrogen barrier in the metal plate 2 by not absorbing hydrogen. Tantalum carbide is particularly advantageous when titanium is used as the metal plate.

The layer system 3 of the third embodiment is suitable for using an electrolysis cell to generate hydrogen at a current density i greater than 500 mA cm ^-2 .

The advantage of a semi-metal layer lying in the middle and / or closed on both sides in a layer system or, in the simplest case, for example a second sub-layer formed of titanium nitride, is a low electrical resistance of 10 to 12 mΩ · cm ⁻² . Likewise, the cover layer can be formed under a possible increase in resistance without the need for a second sub-layer or a metalloid layer. Table 1 shows examples of some layer systems with their own properties.

Layers and selected property values Floor system /
Layer thickness When T = 20 ° C,
Specific surface resistance
(mΩ · cm ^-2 units) Corrosion current in aqueous sulfuric acid solution (pH = 3) at T = 80 ° C in a 2000 mV standard hydrogen electrode
(㎂㎝ ^-2 units) Oxidation stability measured as fluctuation of surface resistance at 2000 mV
(mΩ · cm ^-2 units)

Target value: <20mΩ · cm ^-2 One Gold / 3㎛
(standard) 9 > 100 fitting current 9 to 10 2 Ti / 0.5㎛
TiN / 1㎛
Ir _0.99 -C _0.01 / 10 nm 8 0.001 12 3 Ti _0.67 Nb _0.33 / 0.1㎛
(Ti _0.67 Nb _0.33 ) _1-x N _x
Here, x = 0.40 to 0.55 / 0.4㎛
Ir _0.99 -C _0.01 / 10 nm 7 to 8 0.01 1 to 2 4 Zr / 0.5㎛
ZrN / 1㎛
Ir _0.99 -C _0.01 / 10 nm 11 0.001 11 to 12 5 Ta / 0.05㎛
TaC / 0.5㎛
Ir _0.991 -C _0.009 / 5nm 10 0.001 17 to 18 6 ZrB ₂ / 0.3㎛
Ir _0.7 -B _0.3 / 5 nm 7 Fitting response after 4 hours load

Table 1 lists only some exemplary layer systems. In a preferred manner, the layer system shows no increase in resistance compared to a standard hydrogen electrode in a sulfuric acid solution over several weeks at a temperature with a value of 80 ° C., at an anode load of +2000 mV. The layer system laminated using a sputtering process or ARC process in a high vacuum state or a PECVD process (plasma assisted chemical vapor deposition process) in a fine vacuum state was partially darkened after the load time. However, no visible corrosion phenomenon or significant fluctuation in surface resistance occurred.

1a, 1b, 1c: parts
2: Metal plate
2 ': coated metal plate
2 ": coated and deformed metal plate
2 "': Residual metal plate
3: Floor system
3a: cover layer
4: Lower layer system
4a: first lower layer
4b: second lower layer
5: gas distribution structure
10: bipolar plate
20: first roll made of a metal plate
20 ': second roll made of residual metal plate
30, 30 ': Reel
100: device
200a, 200b: coating unit (s)
300: deformation unit (s)
400: deforming and / or shear cutting unit
500: stamping unit
600: transfer unit

Claims (10)

A method for manufacturing parts (1a, 1b, 1c), especially parts for energy systems, such as fuel cells or electrolytic cells,
Consecutive steps:
a) providing a first roll 20 from a metal plate 2 having a material thickness of a metal plate 2 of less than 500 μm,
b) unwinding the metal plate 2 from the first roll 20 by conveying the first end of the first roll 20 in the supply direction,
c) conveying the first end of the first roll 20 and subsequent metal plate regions to pass through one or more coating devices 200a, 200b, wherein at least one side of the metal plate 2 is physically and physically within the coating device. / Or coating by a chemical vapor deposition process,
d) performing one or more deformation processes on the coated metal plate 2 ',
e) forming a plurality of parts 1a, 1b, 1c by cutting from the coated metal plate 2 ', and
f) winding the coated remaining metal plate (2 ") with a second roll (20 '), wherein the continuous transfer of the metal plate (2) from the first roll (20) to the second roll (20') is performed Including, parts manufacturing method. The method of claim 1, wherein the one or more deformation processes include deep drawing and / or extrusion processing and / or hydroforming. The layer system (3) according to claim 1 or 2, comprising a cover layer (3a) facing away from the metal plate (2) by one or more coating devices (200a, 200b) on the metal plate (2). Is provided, the cover layer (3a) is formed from a homogeneous or heterogeneous metal solid solution, the solid solution contains a first chemical element selected from the group of precious metals in the iridium form at a concentration of 99At .-% or more,
Contains a first chemical element selected from the iridium-type precious metal group and a second chemical element selected from the ruthenium-type precious metal group, wherein the first chemical element and the second chemical element element are present in a concentration of at least 99At .-%, Furthermore, the method of manufacturing a part, containing at least one non-metallic chemical element selected from the group containing nitrogen, carbon, and fluorine, and further optionally presenting only oxygen and / or hydrogen in trace amounts. 4. The layer system (3) according to claim 3, wherein the layer system (3) is also formed comprising a lower layer system (4), the lower layer system (4) comprising one or more chemical elements selected from the group titanium, niobium, hafnium, zirconium, tantalum. The component manufacturing method which has the above sublayers (4a, 4b). 5. The system according to claim 4, wherein the lower layer system (4) comprises at least one first lower layer (4a) in the form of a metal alloy layer comprising the chemical elements titanium and niobium; Part manufacturing, further comprising a second sub-layer (4b) further comprising at least one chemical element selected from the group of titanium, niobium, hafnium, zirconium, tantalum and at least one non-metallic element selected from the group of nitrogen, carbon, boron, fluorine Way. 6. Method according to claim 5, wherein a second sub-layer (4b) is disposed between the first sub-layer (4a) and the cover layer (3a). A bipolar plate (10) comprising one or more parts (1a, 1b, 1c) made according to any one of the preceding claims. The bipolar plate (10) according to claim 7, comprising two parts (1a, 1b) connected to each other by bonding. A fuel cell, in particular a polymer electrolyte fuel cell, comprising at least one bipolar plate 10 according to claim 7. An electrolytic cell comprising at least one bipolar plate (10) according to claim 7 or 8.

Images